Question 1
(a) Define the term output device.
(b) Give the two types of printers.
(c)(i) Construct a Truth Table for an AND gate with two input signals.
(ii) State the output of an OR gate with the input signals 0 and 1.
(d) List two types of logic gate that gives an output of 1 when all of its input signals are 1.
Observation
The expected answer is:
(a) Definition of output device
An output device is an electronic device that displays information from the computer to the user either in form of soft copy and/or hard copy format or in the form of audio and/or video format. Examples include printers, monitors, speakers, plotters.
An output device is any piece of computer hardware equipment which converts information into a human-perceptible form such as text, graphics, tactile, audio, or video.
An output device is any piece of computer hardware equipment which converts information into a physical machine-readable form for use with other non-computerized equipment
It is a device that receives the processed data from the computer and transforms it in the form of audio/ video signal, or physical reproductions.
A computer’s output devices are those parts of computer hardware equipment or peripheral that convert the information or data received from a computer into readable form. It can be text, graphics, audio, or video.
Computer output devices receive information from the computer and carry data that has been processed by the computer to the user.
(b) Types of printers
Impact printers and non-impact printers
(c) (i) Truth Table for AND gate
A |
B |
Z=A.B |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
1 |
0 |
1 |
1 |
1 |
(ii) The output of OR gate with input “0” and “1” is 1
(d) Two types of logic gate that gives “1” as output when all of its input are “1” are:
OR gate;
AND gate;
XNOR gate.
The question tested candidates’ knowledge of hardware. The Chief Examiner reported that most of the candidates who attempted the question showed good knowledge of the area tested.